I ended up using a field anyways, lol.
That said, I got a new question, how do I script a button to add or subtract from the existing value of the slider?
Presuming a slider named "slider1", you could give a button a script like
on click do slider1.value:slider1.value + 1 end
This situation is very similar to one of the examples in The Decker Guided Tour and one of the examples in the introductory primer in the Lil Reference Manual.